1/* $NetBSD: setjmp.S,v 1.11 2007/10/08 13:06:00 uwe Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp 36 */ 37 38#include <machine/asm.h> 39#if defined(LIBC_SCCS) && !defined(lint) 40#if 0 41 .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 42#else 43 RCSID("$NetBSD: setjmp.S,v 1.11 2007/10/08 13:06:00 uwe Exp $") 44#endif 45#endif /* LIBC_SCCS and not lint */ 46 47/* 48 * C library -- setjmp, longjmp 49 * 50 * longjmp(a,v) 51 * will generate a "return(v)" from 52 * the last call to 53 * setjmp(a) 54 * by restoring registers from the stack, 55 * and a struct sigcontext, see <signal.h> 56 */ 57 58#include "SYS.h" 59 60ENTRY(__setjmp14) 61 save %sp, -CCFSZ, %sp 62 /* 63 * local vars on stack: struct sigstack foo @ offset 0x48 64 * Note: sc_g1 is not used; sc_o0 is set in longjmp() 65 */ 66 mov 1, %o0 /* SIG_BLOCK */ 67 add %i0, 32, %o2 /* build sigcontext sc.sc_mask */ 68 call _C_LABEL(__sigprocmask14) 69 clr %o1 /* sigprocmask(SIG_BLOCK, NULL, &sc.sc_mask) */ 70 71 add %sp, 0x48, %o1 /* (foo being in arg dump area) */ 72 call _C_LABEL(__sigaltstack14) 73 clr %o0 /* sigstack(NULL, &foo) */ 74 75 ld [%sp + 0x48 + 8], %o0 /* foo.ss_flags */ 76 and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 77 st %o1, [%i0 + 0] /* sc.sc_onstack = current onstack; */ 78 st %fp, [%i0 + 8] /* sc.sc_sp = (caller's) sp */ 79 add %i7, 8, %o0 80 st %o0, [%i0 + 12] /* sc.sc_pc = return_pc */ 81 add %i7, 12, %o0 82 st %o0, [%i0 + 16] /* sc.sc_npc = return_pc + 4 */ 83 st %g0, [%i0 + 20] /* sc.sc_psr = (clean psr) */ 84 ret /* return 0 */ 85 restore %g0, %g0, %o0 86 87